/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package solver;

import com.hp.hpl.jena.clusteredtdb.pgraph.NetworkedGraphTDB;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.sparql.core.BasicPattern;
import com.hp.hpl.jena.sparql.engine.ExecutionContext;
import com.hp.hpl.jena.sparql.engine.QueryIterator;
import com.hp.hpl.jena.sparql.engine.main.StageGenerator;
import com.hp.hpl.jena.tdb.solver.SolverLib;

public class StageGeneratorDirectClusteredTDB implements StageGenerator {
	
	StageGenerator above = null ;
    
    public StageGeneratorDirectClusteredTDB(StageGenerator original)
    {
        above = original ;
    }
	
	@Override
    public QueryIterator execute(final BasicPattern pattern, QueryIterator input, ExecutionContext execCxt)
    {
        // --- In case this isn't for TDB
        Graph g = execCxt.getActiveGraph() ;
        
        if ( ! ( g instanceof NetworkedGraphTDB ) )
            // Not us - bounce up the StageGenerator chain
            return above.execute(pattern, input, execCxt) ;
        NetworkedGraphTDB graph = (NetworkedGraphTDB)g ;
        return SolverLib.execute(graph, pattern, input, execCxt) ;
    }
}

/*
 * (c) Copyright 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
